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Fig. 4. Time-course of the short-circuit current (Isc) across a split gill lamellae of a posterior gill (representative of three trials). The arrows indicate application of the different treatments. Isosmotic: 1045 mosmol l-1; Hyposmotic: 698.6 mosmol l-1; Isosucrose: Hyposmotic saline plus 345.4 mmol l-1 sucrose (same osmolarity as Isosmotic saline).